Translating electromagnetic motor



Mayzf, 1933. E; L, R955 1,910,638

TRANSLATING ELECTROMAGNETIG MOTOR Filed May 27, 1931 FIL; E

Pfg E v Malla/fill Edwin L Rose `5gewas.

Patented May 23, 1933 UNITED STATES nous uw PATENT OFFICE EDWIN L. ROSE, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO DAI-ILSTROM METALLIC DOOR COMPANY, OF J'AMESTOWN, NEW YORK, A CORPORATION OF NEW YORK TRANSLATING- ELECTROMAGNETIC MOTOR Application led May 27, 1931.

This invention relates to an improvement in an electro-magnetic motor and more particularly to one attached to and adapted to actuate sliding doors.

In its preferred embodiment this invention makes provision of primary and secondary coils or windings, arranged in a manner such that electrical currents applied in on-e set of windings cause relative movement of the other of said windings. By attaching the relative movable coil to a sliding door and the other to a door enclosure, the reactio-n of said coils upon each other, when energized, causes said door to move in one direction or another.

The principal object of this invention lies in the provision of an electro-magnetic device comprised of fixed and movable coils, which, when energized through a suitable current supply, are relatively translated.

Another object of the invention is to provide a device of this class in conjunction with a sliding door, which, when energized, moves said door from one position to another. f f

A further "'/object of the invention is to provide a device of this class which, by reason of its simplicity, may be directly connected with a sliding door thereby eliminating the usual linkage between said door and its source of motivation. y

Other and further ob]ects of the invention reside in details of construction and operation as disclosed in the following specilication and in the drawing forming a part thereof; and in which Fig. 1 is a rear elevation of a door enclosure showing one modification of this invention applied for use therewith;

Fig. 2 is a view similar to Figure 1, showing the door actuating mechanism in closed door position;

Fig. 3 is a view similar to Figure 1, showing the mechanism in open door position;

Fig. 4 is an enlarged vertical sectional view taken substantially on the line 4-4 of Figure 1;

Fig. 5 is an enlarged horizontal sectional view of certain of the fixed and movable Serial No. 540,354.

coils, taken substantially on the line 5-5 of Figure 2;

Fig. 6 is a diagram showing the wired connections and means for reversing the direction of the movable elements of the device; and

Fig. 7 is a diagram showing an alternate wired connection by which all coils are energized during movement of the elements.

Referring to the drawing and particularly to Figure 1 thereof, an electro-magnetic motor is shown mounted for use upon an entrance enclosure generally indicated by the reference numeral 10. Supported, in any suitable manner, as by brackets 12, are spaced coils 14, 15 and 16. The center coil lies substantially midway between the end coils 14 and 16. Each coil is formed with a hollow center defined by a non-metallic sleeve 17. Connected with and supported in the sleeve 17 in each coil is a hollow member 18 having a laminated core of magnetic material. Where this member is made of metal or other conducting material, it should be made with a longitudinal slot throughout its length in order that it may not form a short circuited turn linking the magnetic ield of the primary coils.

It is pointed out that, due to the provision of coils which obtain their current through induction from adjacent coils directly connected with a source of alternating current supply, the core of the member 18 upon which the movable coils are guided, is preferably of a laminated nature. Without the replacement of the movable, so-called short circuited coil, it would be impossible to operate this device from and by means of a direct current.

For the purpose of a clearer understanding of the invention, the member 18 may be considered as divided into two elements, namely, 19 and 20. Encircling element 19 and movable relative thereto is a short-circuited coil or winding 22 which is mounted on a door hanger 27. On the element 2() a further short circuited coil 23 is provided. These coils may be rectangular or, as shown in the drawing, cylindrical members which are adapted to loosely encircle the elements 19 and 20. The coils 22 and 23 constitute secondary windings and coils 14, 15 and 16 the primary windings of an electro-magnetic motor. Secured to each of the coils 22 and 23 are brackets 24 which terminate at their lower ends in tianges 25. Each of these flanges engage duplicate door hangers 27 in which, in this instance, track rollers 28 and track 29 are located. To the lower portion 31 of the hangers and attached by bolts 32 are doors 34. Inasmuch as the structural details of the door and hanger form no part of this invention other than to illustrate a useful application of this invention, further description thereof is unnecessary.

Coils 14, 15 and 16 are mounted upon the enclosure 10 in spaced relation to each other,`

said spacing being of a distance substantially equal to the distance of travel of the doors from one position of rest to another. The center coil 15 is provided with leads 36 and 37. Referring to Figure 2 in which the coils 22 and 23 are shown in close proximity with the coil 15, it will be understood that when current is supplied to coil 15, a magnetic iiux is set up which, for purposes of illustration, may be considered as having negative polarity adjacent the winding 22 and positive polarity adjacent the winding 23, the winding 22 having a positive polarity on the side adjacent 15 and the winding 23 a corresponding negative polarity as a result of the currents induced in them by the field of coil 15. Consequently when coil 15 is energized, the coils 22 and 23, being of opposite polarity from the adjacent portions of said energized coil, will be repelled and caused to move longitudinally of the member 18 toward and into close proximity with coils 14 and 16. (See Figure 3.)

Coils 14 and 16 are arranged with leads 38, 39 and common lead 40, being in series with each other and adapted to be simultaneously energized to cause closing of the doors 34. Through proper designing these coils may also be operated in parallel. Coil 14 has a negative polarity adjacent the coil 22 and coil 16 a negative polarity adjacent coil 23. Then the switch 41, shown in the diagram of Figure 6, is thrown to engage the contacts or leads 38 and 39, coils 14 and 16 are energized from a source of current supply and immediately sets up magnetic forces which repels coils 22 and 23, causing them to move toward each other to the position shown in Figure 2 of the drawing.

Should it be found desirable to increase the translating force of the electro-magnetic motor above described, the diagram in Figure 7 illustrates one method by which this may be accomplished. When the doors 34 are to be opened, the switch 42 is closed thus causing current to energize .colil 15 and set up a magnetic field with which to repel coils 22 and 23. Simultaneously with energizing coil 15, the end coils 14 and 16 are short circuited by connecting leads 38 and 39. Short circuiting these coils sets up induced current, the magnetic fields of which have a polarity opposite that of the approaching coils 22 and 23, thus causing said moving coils to be attracted. It may thus be understood that simultaneously with the repellent force exerted by coil 15 an attracting force is exerted by the end coils. To close the doors the procedure is reversed by throwing switch 42 in the opposite direction and causes coils 14 and 16 to be energized to repel the adjacent coils 22 and 23. The center coil 15, short circuited by connecting leads 36 and 37 and by reason of the induced current therein, sets up a magnetic force which attracts the moving coils.

Although this device has been shown as applied to bi-parting doors, it is obvious from a consideration thereof that through the elimination of one energized coil and one short-circuited coil, as well as that portion of the rail and other structure upon which said coils are mounted, a single door may be successfully actuated through the use of the remainder of the structure. It is also apparent that by providing a rack and pinion or gearing of one form or another by which to connect the powered door with a second door, the above described structure, by which each of the bi-parting doors are actuated, may be made to operate two or three speed doors.

While applicant has shown but one modification of an electro-magnetic motor, it will be understood that other modifications or adaptations may be made without departing from the spirit and scope of the invention as set forth and defined in the hereunto annexed claims.

Having thus set forth my invention what I claim as new and for which I desire protection by Letters Patent is:

1. A rectilinear induction motor comprising a plurality of fixed primary coils, means enclosing and supporting said primary coils, a core common to all of said primary coils, a short circuited secondary coil, said secondary coil being movably supported in close proximity with said core and said coils.

2. A rectilinear induction motor comprising a plurality of spaced fixed coils, a core common to all of said primary coils, a short circuited secondary coil, said secondary coil being mounted on and movable longitudinally of said core toward one or another of said primary coils.

3. A rectilinear induction motor comprising a plurality of independently supported, spaced primary coils, a core supported by and common to all of said primary coils, a single turn short circuited secondary coil mounted on and movable relative to said primary coils.

4. A rectilinear induction motor comprising a plurality of spaced primary coils, a sleeve projecting through each of said primary coils, a core element extending from one to the next adjacent primary coil, said element being terminated in and supported by said sleeves, and a single turn secondary coil mounted on said core, said secondary coil being movable axially of said element.

5. A rectilinear induction motor comprising a plurality of spaced primary coils, an iron core extending from one to the next adjacent of said primary coils, a non-magnetic metal member enclosing said core, brackets supporting the ends of said member adjacent to said coils, and a single turn secondary coil mounted on said member and movable axially thereof.

6. A rectilinear induction motor comprising spaced, fixed primary coils, an iron core common to all of said coils, a non-magnetic metallic member enclosing said core, a sleeve delining a central opening in each of said primary coils, the ends of said member being mounted in the sleeve openings of adjacent primary coils, and a single turn secondary coil mounted on said member, said secondary coil being adapted to move axially of said member in one direction or the other.

In testimony whereof I have aiixed my signature.

EDWIN L. ROSE.

- e tlv-74V? f CERTIFICATE OF CORRECTION.

EDWIN L. ROSE.

It is hereby certified that error appears in the printed specification. o theabove numbered patent requiring correction as follows: Page 2, line^119, claim 2, after the word "fixed" insert the word "primary"; and that the said Letters. Patent should be read with this correction therein that, the same may. conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of August, A. I). 1933.

M. J. Moore.

(Seal) Actingr Commissioner oi Patente.

CERTFIGATE OF CORRECTION.

Pajtent No. 1,910,638. May 23, 1933.

EDWN L. ROSE.

Et is hefery oertiet that effet" appears in the printed specification of the above numbered miem requiring corfecion as follows: Page 2, line 119, olaim 2, after the word "fxe" nsex the word primary"; and that the said Letters Patem shou be rea with this corrections therein that the same may conform to the record o the. case it: the Patent Office. ,t

Signe and seated this 29th day of August, A. l). 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patenti. 

